C語言 判斷該天是本年的第幾天

#include<stdio.h> int main() {     int a[12]={31,28,31,30,31,30,31,31,30,31,30,31};     int year,month,day;     int days=0,i;     scanf("%d%d%d",&year,&month,&day);     for(i=0;i<month-1;i++)     days

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